Ideal Weight Calculator
Enter your height and sex to see the ideal body weight from four widely cited formulas — Devine (1974), Robinson (1983), Miller (1983) and Hamwi (1964) — side by side, in both kilograms and pounds. You also get the range across the formulas, their average and the weight range that corresponds to a healthy BMI for comparison.
How to use the Ideal Weight Calculator
- Choose metric or imperial units.
- Select your sex.
- Enter your height.
- Press Calculate to compare the four formulas and the overall range.
Features
- Devine, Robinson, Miller and Hamwi formulas
- Results in kilograms and pounds
- Range, average and healthy-BMI comparison
- Equation shown for each formula
- Warning for heights below 5 ft where formulas are extrapolated
Benefits
- See how much "ideal weight" estimates differ by method
- A reference range rather than a single misleading number
- Quick lookup for students and clinicians studying the formulas
Frequently asked questions
Why do the formulas give different answers?
Each was derived from different data and assumptions. Devine and Hamwi were designed for medication dosing; Robinson and Miller were later re-fits of population data. Looking at the range is more useful than any single value.
How do the formulas work?
Each starts with a base weight at 5 ft (152.4 cm) and adds a fixed amount per inch above that, with different values for men and women. For example, Devine for men is 50 kg + 2.3 kg per inch over 5 ft.
Do these formulas account for muscle or frame size?
No. They use only height and sex, so athletic or large-framed people may be healthy above these figures.
Should I use this as a weight goal?
Treat it as a rough estimate, not medical advice. A doctor or dietitian can help set a goal that suits your health, body composition and age.
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